Malicious PDF — malware analysis report

Static analysis result for SHA-256 80440903e42a9344…

MALICIOUS

PDF

106.9 KB Created: 2021-07-09 17:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd557a0c456bf5b0259d9783410dab09 SHA-1: acad628cbd9be3c748a9420989317c502ab70f1b SHA-256: 80440903e42a934447091e88d9114296e51b8d455d7b4f27ca4299eae9278827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the linked content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=insults+beginning+with+b
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5bcb334f---jubanaduvalafofe.pdf
    • http://galettedesrois.hu/userfiles/file/10333047217.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e56d9255805ae0ee991dc27154f2e1f/voxivepufajuzaropuris.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c687933a920---buxagozeb.pdf
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/76682384021.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ebb60f3fb---wutufogadezibidinuzakod.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c158e0ccdbe---95542622117.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/fototopudovatosakutujupex.pdf
    • https://pacie.vn/web/uploads/files/zugobada.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d57396f3---sesirijefuxune.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e1360e4d29b---gaworerevorirarojagapi.pdf
    • https://liniagdanskzydowo.pl/files/12830284914.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/wivowebezavelobolon.pdf
    • https://mamo-tato.ro/userfiles/file/40559659188.pdf
    • https://anukulagrotech.com/userfiles/file/9766154581.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aacaff94675---45170417398.pdf
    • https://hyosungulf.com/uploads/file/fevimalezufizegej.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087230f38f28---38620180219.pdf
    • http://conomiya.com/images/uploadedimages/file/disipunesikavabubogodupi.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86d7e4e0f---69284458854.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014281.bin
eb5d783f8e68e3ac38d2914e7fcb2a180a8581c655794cbe1f8d50204a29bbd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14281 10284 bytes
font_01_sfnt_off0001599d.bin
218344a9670e84bb5ac317d6321ac7a6eb3e3f5d67851b77affd840cec2c4d0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1599D 17628 bytes
font_02_sfnt_off000186e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x186E7 16792 bytes